副乳

fùrǔ
  1. accessory breast; supernumerary breast
  2. (coll.) bra bulge; armpit fat

CEDICT

colloquial

Entry Composition

1 副 fù
  1. secondary
  2. auxiliary
  3. deputy
  4. assistant
  5. vice-
  6. abbr. for 副詞 adverb
  7. classifier for pairs, sets of things & facial expressions
2 乳 rǔ
  1. (bound form) breast
  2. (bound form) milk
  3. (bound form) newborn; suckling